#include "vector.hpp"
#include <vector>

using namespace std;

int main()
{
    zch::test1();
    vector<int> a;
    a.reserve(20);
    if(a.empty())
    {
        cout << "yes" << endl;
    }
    else 
    {
        cout << "no" << endl;
    }
    return 0;
}